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Sawfly

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File:Sawfly (Nematus septentrionalis) larvae.jpg
Larvae of Nematus septentrionalis

Sawflies are wasp-like insects that are in the suborder Symphyta within the order Hymenoptera, alongside ants, bees, and wasps. The common name comes from the saw-like appearance of the ovipositor, which the females use to cut into the plants where they lay their eggs. The name is associated especially with the Tenthredinoidea, by far the largest superfamily in the suborder, with about 7,000 known species; in the entire suborder, there are 8,000 described species in more than 800 genera. Symphyta is paraphyletic, consisting of several basal groups within the order Hymenoptera, each one rooted inside the previous group, ending with the Apocrita which are not sawflies.

The primary distinction between sawflies and the Apocrita – the ants, bees, and wasps – is that the adults lack a "wasp waist", and instead have a broad connection between the abdomen and the thorax. Some sawflies are Batesian mimics of wasps and bees, and the ovipositor can be mistaken for a stinger. Sawflies vary in length, most measuring Template:Convert; the largest known sawfly measured Template:Cvt. The larvae are caterpillar-like, but can be distinguished by the number of prolegs and the absence of crochets in sawfly larvae. The great majority of sawflies are plant-eating, though the members of the superfamily Orussoidea are parasitic.

Predators include birds, insects and small animals. The larvae of some species have anti-predator adaptations such as regurgitating irritating liquid and clustering together for safety in numbers. Sawflies are hosts to many parasitoids, most of which are Hymenoptera, the rest being Diptera.

Adult sawflies are short-lived, with a life expectancy of 7–9 days, though the larval stage can last from months to years, depending on the species. Parthenogenetic females, which do not need to mate to produce fertilised eggs, are common in the suborder, though many species have males. The adults feed on pollen, nectar, honeydew, sap, other insects, including hemolymph of the larvae hosts; they have mouth pieces adapted to these types of feeding.<ref>Template:Cite journal</ref>

Sawflies go through a complete metamorphosis with four distinct life stages – egg, larva, pupa and adult. The female uses her ovipositor to drill into plant material (or, in the case of Orussoidea, other insects) and then lays eggs in groups called rafts or pods. After hatching, larvae feed on plants, often in groups. As they approach adulthood, the larvae seek a protected spot to pupate, typically in bark or the soil. Large populations of species such as the pine sawfly can cause substantial damage to economic forestry, while others such as the iris sawfly are major pests in horticulture. Outbreaks of sawfly larvae can defoliate trees and may cause dieback, stunting or death. Sawflies can be controlled through the use of insecticides, natural predators and parasitoids, or mechanical methods.

Sawflies first appeared 250 million years ago in the Triassic. The oldest superfamily, the Xyeloidea, has existed into the present. Over 200Template:Nbspmillion years ago, a lineage of sawflies evolved a parasitoid lifestyle, with carnivorous larvae that ate the eggs or larvae of other insects. Sawflies are distributed globally, though they are more diverse in the northernmost hemispheres.

EtymologyEdit

File:Dolerus nitens.jpg
Sawfly laying eggs in a plant, using the serrated saw-like ovipositor for which the group is named

The suborder name "Symphyta" derives from the Greek word Template:Transliteration, meaning 'grown together', referring to the group's distinctive lack of a wasp waist between prostomium and peristomium.<ref>Template:Cite dictionary</ref> Its common name, "sawfly", derives from the saw-like ovipositor that is used for egg-laying, in which a female makes a slit in either a stem or plant leaf to deposit the eggs.<ref name=AusMus/> The first known use of this name was in 1773.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Sawflies are also known as "wood-wasps".<ref name="Gordh_Headrick_2011">Template:Cite book</ref>

PhylogenyEdit

File:Entomologie1.jpg
Carl Gerstaecker established the suborder Symphyta.

In his original description of Hymenoptera in 1863, German zoologist Carl Gerstaecker divided them into three groups, Hymenoptera aculeata, Hymenoptera apocrita and Hymenoptera phytophaga.<ref>Template:Cite book</ref> However, four years later in 1867, he described just two groups, H. apocrita syn. genuina and H. symphyta syn. phytophaga.<ref name="Gerstaecker_1867"/> Consequently, the name Symphyta is given to Gerstaecker as the zoological authority. In his description, Gerstaecker distinguished the two groups by the transfer of the first abdominal segment to the thorax in the Apocrita, compared to the Symphyta. Consequently, there are only eight dorsal half segments in the Apocrita, against nine in the Symphyta. The larvae are distinguished in a similar way.<ref>Template:Cite book</ref>

The Symphyta have therefore traditionally been considered, alongside the Apocrita, to form one of two suborders of Hymenoptera.Template:Sfn<ref name="Sharkey_2007">Template:Cite journal</ref> Symphyta are the more primitive group, with comparatively complete venation, larvae that are largely phytophagous, and without a "wasp-waist", a symplesiomorphic feature. Together, the Symphyta make up less than 10% of hymenopteran species.<ref name="Mao_et_al_2015">Template:Cite journal</ref> While the terms sawfly and Symphyta have been used synonymously, the Symphyta have also been divided into three groups, true sawflies (phyllophaga), woodwasps or xylophaga (Siricidae), and Orussidae. The three groupings have been distinguished by the true sawflies' ventral serrated or saw-like ovipositor for sawing holes in vegetation to deposit eggs, while the woodwasp ovipositor penetrates wood and the Orussidae behave as external parasitoids of wood-boring beetles. The woodwasps themselves are a paraphyletic ancestral grade. Despite these limitations, the terms have utility and are common in the literature.<ref name="Sharkey_2007"/>

While most hymenopteran superfamilies are monophyletic, as is Hymenoptera, the Symphyta has long been seen to be paraphyletic.<ref>Template:Cite journal</ref><ref name="Song_et_al_2016">Template:Cite journal</ref> Cladistic methods and molecular phylogenetics are improving the understanding of relationships between the superfamilies, resulting in revisions at the level of superfamily and family.<ref>Template:Cite book</ref> The Symphyta are the most primitive (basal) taxa within the Hymenoptera (some going back 250 million years), and one of the taxa within the Symphyta gave rise to the monophyletic suborder Apocrita (wasps, bees, and ants).<ref name="Mao_et_al_2015"/><ref name="Song_et_al_2016"/> In cladistic analyses the Orussoidea are consistently the sister group to the Apocrita.<ref name="Sharkey_2007"/><ref name="Mao_et_al_2015"/>

The oldest unambiguous sawfly fossils date back to the Middle or Late Triassic. These fossils, from the family Xyelidae, are the oldest of all Hymenoptera.<ref>Template:Cite book</ref> One fossil, Archexyela ipswichensis from Queensland is between 205.6 and 221.5Template:Nbspmillion years of age, making it among the oldest of all sawfly fossils.<ref>Template:Cite journal</ref> More Xyelid fossils have been discovered from the Middle Jurassic and the Cretaceous, but the family was less diverse then than during the Mesozoic and Tertiary. The subfamily Xyelinae were plentiful during these time periods, in which Tertiary faunas were dominated by the tribe Xyelini; these are indicative of a humid and warm climate.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>

The cladogram is based on Schulmeister 2003.<ref>Template:Cite journal</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Template:Cladogram

TaxonomyEdit

File:Syntexis libocedrii.jpg
Anaxyeloidea: Syntexis libocedrii

There are approximately 8,000 species of sawfly in more than 800 genera, although new species continue to be discovered.Template:Sfn<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> However, earlier studies indicated that 10,000 species grouped into about 1,000 genera were known.<ref>Template:Cite journal</ref> Early phylogenies such as that of Alexandr Rasnitsyn, based on morphology and behaviour, identified nine clades which did not reflect the historical superfamilies.<ref>Template:Cite journal</ref> Such classifications were replaced by those using molecular methods, starting with Dowton and Austin (1994).<ref>Template:Cite journal</ref> As of 2013, the Symphyta are treated as nine superfamilies (one extinct) and 25 families. Most sawflies belong to the Tenthredinoidea superfamily, with about 7,000 species worldwide. Tenthredinoidea has six families, of which Tenthredinidae is by far the largest with some 5,500 species.<ref name="Aguiar_et_al_2013"/>Template:Sfn

Extinct taxa are indicated by a dagger (Template:Extinct).

Superfamilies and familiesEdit

DescriptionEdit

Template:Multiple image

Many species of sawfly have retained their ancestral attributes throughout time, specifically their plant-eating habits, wing veins and the unmodified abdomen, where the first two segments appear like the succeeding segments.Template:Sfn The absence of the narrow wasp waist distinguishes sawflies from other members of hymenoptera, although some are Batesian mimics with Template:Not a typo similar to wasps and bees, and the ovipositor can be mistaken for a stinger.<ref name="Burton_Burton_2002"/> Most sawflies are stubby and soft-bodied, and fly weakly.Template:Sfn Sawflies vary in length: Urocerus gigas, which can be mistaken as a wasp due to its black-and-yellow striped body, can grow up to Template:Cvt in length, but among the largest sawflies ever discovered was Hoplitolyda duolunica from the Mesozoic, with a body length of Template:Cvt and a wingspan of Template:Cvt.<ref name="Burton_Burton_2002"/><ref>Template:Cite journal</ref> The smaller species only reach lengths of Template:Cvt.<ref>Template:Cite book</ref>

Heads of sawflies vary in size, shape and sturdiness, as well as the positions of the eyes and antennae. They are characterised in four head types: open head, maxapontal head, closed head and genapontal head. The open head is simplistic, whereas all the other heads are derived.Template:Sfn The head is also hypognathous, meaning that the lower mouthparts are directed downwards. When in use, the mouthparts may be directed forwards, but this is only caused when the sawfly swings its entire head forward in a pendulum motion.Template:Sfn Unlike most primitive insects, the sutures (rigid joints between two or more hard elements on an organism) and sclerites (hardened body parts) are obsolescent or absent. The clypeus (a sclerite that makes up an insects "face") is not divided into a pre- and postclypeus, but rather separated from the front.Template:Sfn The antennal sclerites are fused with the surrounding head capsule, but these are sometimes separated by a suture. The number of segments in the antennae vary from six in the Accorduleceridae to 30 or more in the Pamphiliidae.Template:Sfn The compound eyes are large with a number of facets, and there are three ocelli between the dorsal portions of the compound eyes.Template:Sfn The tentorium comprises the whole inner skeleton of the head.Template:Sfn

Three segments make up the thorax: the mesothorax, metathorax and prothorax, as well as the exoskeletal plates that connect with these segments.Template:Sfn The legs have spurs on their fourth segments, the tibiae.Template:Sfn Sawflies have two pairs of translucent wings. The fore and hind wings are locked together with hooks.<ref>Template:Cite book</ref> Parallel development in sawfly wings is most frequent in the anal veins. In all sawflies, 2A and 3A tend to fuse with the first anal vein. This occurs in several families including Argidae, Diprionidae and Cimbicidae.Template:Sfn

File:Abia sericea 2.jpg
Aposematically coloured caterpillar-like larva of Abia sericea

The larvae of sawflies are easily mistaken for lepidopteran larvae (caterpillars). However, several morphological differences can distinguish the two: while both larvae share three pairs of thoracic legs and an apical pair of abdominal prolegs, lepidopteran caterpillars have four pairs of prolegs on abdominal segments 3–6 while sawfly larvae have five pairs of prolegs located on abdominal segments 2–6; crochets are present on lepidopteran larvae, whereas on sawfly larvae they are not; the prolegs of both larvae gradually disappear by the time they burrow into the ground, therefore making it difficult to distinguish the two; and sawfly larvae only have a single pair of minute eyes, whereas lepidopteran larvae have four to six eyes on each side of the head.Template:Sfn<ref name="Burton_Burton_2002"/> Sawfly larvae behave like lepidopteran larvae, walking about and eating foliage. Some groups have larvae that are eyeless and almost legless; these larvae make tunnels in plant tissues including wood.Template:Sfn Many species of sawfly larvae are strikingly coloured, exhibiting colour combinations such as black and white while others are black and yellow. This is a warning colouration because some larvae can secrete irritating fluids from glands located on their undersides.<ref name="Burton_Burton_2002"/>

DistributionEdit

Sawflies are widely distributed throughout the world.<ref>Template:Cite journal</ref> The largest family, the Tenthredinidae, with some 5,000 species, are found on all continents except Antarctica, though they are most abundant and diverse in the temperate regions of the northern hemisphere; they are absent from New Zealand and there are few of them in Australia. The next largest family, the Argidae, with some 800 species, is also worldwide, but is most common in the tropics, especially in Africa, where they feed on woody and herbaceous angiosperms. Of the other families, the Blasticotomidae and Megalodontidae are Palearctic; the Xyelidae, Pamphilidae, Diprionidae, Cimbicidae, and Cephidae are Holarctic, while the Siricidae are mainly Holarctic with some tropical species. The parasitic Orussidae are found worldwide, mostly in tropical and subtropical regions. The wood-boring Xiphydriidae are worldwide, but most species live in the subtropical parts of Asia.Template:Sfn

Behaviour and ecologyEdit

File:Hartigia trimaculata larvae in rose stem (rose stem sawfly).jpg
Rose stem sawfly (Hartigia trimaculata) larva in a rose stem

Sawflies are mostly herbivores, feeding on plants that have a high concentration of chemical defences. These insects are either resistant to the chemical substances, or they avoid areas of the plant that have high concentrations of chemicals.<ref>Template:Cite book</ref> The larvae primarily feed in groups; they are folivores, eating plants and fruits on native trees and shrubs, though some are parasitic.<ref name=AusMus>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=BBC>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>Template:Cite journal</ref> However, this is not always the case; Monterey pine sawfly (Itycorsia) larvae are solitary web-spinners that feed on Monterey pine trees inside a silken web.<ref name=Klein1994>Template:Cite journal</ref> The adults feed on pollen and nectar.<ref name=BBC/>

File:Forde Caterpillars 2012.JPG
Anti-predator adaptation: spitfire sawfly larvae grouped together for safety in numbers

Sawflies are eaten by a wide variety of predators. While many birds find the larvae distasteful, some such as the currawong (Strepera) and stonechats (Saxicola) eat both adults and larvae.<ref>Template:Cite journal</ref><ref name=SA1992/> The larvae are an important food source for the chicks of several birds, including partridges.<ref>Template:Cite report</ref> Sawfly and moth larvae form one third of the diet of nestling corn buntings (Emberiza calandra), with sawfly larvae being eaten more frequently on cool days.<ref>Template:Cite journal</ref> Black grouse (Tetrao tetrix) chicks show a strong preference for sawfly larvae.<ref name=Bstudy2001>Template:Cite journal</ref><ref>Template:Cite journal</ref> Sawfly larvae formed 43% of the diet of chestnut-backed chickadees (Poecile rufescens).<ref name=Klein1994/> Small carnivorous mammals such as the masked shrew (Sorex cinereus), the northern short-tailed shrew (Blarina brevicauda) and the deer mouse (Peromyscus maniculatus) predate heavily on sawfly cocoons.<ref>Template:Cite journal</ref> Insects such as ants and certain species of predatory wasps (Vespula vulgaris) eat adult sawflies and the larvae, as do lizards and frogs.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> Pardalotes, honeyeaters and fantails (Rhipidura) occasionally consume laid eggs, and several species of beetle larvae prey on the pupae.<ref name=SA1992/>

The larvae have several anti-predator adaptations. While adults are unable to sting, the larvae of species such as the spitfire sawfly regurgitate a distasteful irritating liquid, which makes predators such as ants avoid the larvae.<ref name=AusMus/><ref Name=PIRSA>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> In some species, the larvae cluster together, reducing their chances of being killed, and in some cases form together with their heads pointing outwards or tap their abdomens up and down.<ref name=SA1992>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>Template:Cite book</ref> Some adults bear black and yellow markings that mimic wasps.<ref name="Burton_Burton_2002"/>

ParasitesEdit

File:Sawfly parasitic wasp (Dahlbominus fuscipennis).jpg
Parasitoidal eulophid wasps (Dahlbominus fuscipennis (sv)) emerging from a sawfly cocoon

Sawflies are hosts to many parasitoids, most of which are parasitic Hymenoptera; more than 40 species are known to attack them. However, information regarding these species is minimal, and fewer than 10 of these species actually cause a significant impact on sawfly populations.Template:Sfn Many of these species attack their hosts in the grass or in other parasitoids.Template:Clarify Well known and important parasitoids include Braconidae, Eulophidae and Ichneumonidae. Braconid wasps attack sawflies in many regions throughout the world, in which they are ectoparasitoids, meaning that the larvae live and feed outside of the hosts body; braconids have more of an impact on sawfly populations in the New World than they do in the Old World, possibly because there are no ichneumonid parasitoids in North America. Some braconid wasps that attack sawflies include Bracon cephi, B. lisogaster, B. terabeila and Heteropilus cephi.Template:Sfn<ref>Template:Cite book</ref><ref>Template:Cite journal</ref> Female braconids locate sawfly larvae through the vibrations they produce when feeding, followed by inserting the ovipostior and paralysing the larva before laying eggs inside the host. These eggs hatch inside the larva within a few days, where they feed on the host. The entire host's body may be consumed by the braconid larvae, except for the head capsule and epidermis. The larvae complete their development within two or three weeks.Template:Sfn

Ten species of wasps in the family Ichneumonidae attack sawfly populations, although these species are usually rare. The most important parasitoids in this family are species in the genus Collyria. Unlike braconids, the larvae are endoparasitoids, meaning that the larvae live and feed inside the hosts body.Template:Sfn One well known ichneumonid is Collyria coxator, which is a dominant parasitoid of C. pygmaeus. Recorded parasitism rates in Europe are between 20–76%, and as many as eight eggs can be found in a single larva, but only one Collyria individual will emerge from its host. The larva may remain inside of their host until spring, where it emerges and pupates.Template:Sfn

Several species in the family Eulophidae attack sawflies, although their impact is low. Two species in the genus Pediobius have been studied; the two species are internal larval parasitoids and have only been found in the northern hemisphere. Parasitism of sawflies by eulophids in grass exceeds 50%, but only 5% in wheat. It is unknown as to why the attack rate in wheat is low.Template:Sfn Furthermore, some fungal and bacterial diseases are known to infect eggs and pupa in warm wet weather.<ref name=SA1992/>

Outbreaks of certain sawfly species, such as Diprion polytomum, have led scientists to investigate and possibly collect their natural enemies to control them. Parasites of D. polytomum have been extensively investigated, showing that 31 species of hymenopterous and dipterous parasites attack it. These parasites have been used in successful biological control against pest sawflies, including Cephus cinctus throughout the 1930s and 1950s and C. pygmaeus in the 1930s and 1940s.Template:Sfn<ref>Template:Cite journal</ref>

Life cycle and reproductionEdit

File:Lophyre mâle sortant de son cocon-page0001.jpg
Adult male newly emerged from its cocoon

Like all other hymenopteran insects, sawflies go through a complete metamorphosis with four distinct life stages – egg, larva, pupa and adult.<ref>Template:Cite book</ref> Many species are parthenogenetic, meaning that females do not need fertilization to create viable eggs. Unfertilized eggs develop as male, while fertilized eggs develop into females (arrhenotoky). The lifespan of an individual sawfly is two months to two years, though the adult life stage is often very short (approximately 7 – 9 days), only long enough for the females to lay their eggs.<ref name="Burton_Burton_2002">Template:Cite book</ref><ref name=SA1992/><ref>Template:Cite journal</ref> The female uses its ovipositor to drill into plant material to lay her eggs (though the family Orussoidea lay their eggs in other insects). Plant-eating sawflies most commonly are associated with leafy material but some specialize on wood, and the ovipositors of these species (such as the family Siricidae) are specially adapted for the task of drilling through bark. Once the incision has been made, the female will lay as many as 30 to 90 eggs. Females avoid the shade when laying their eggs because the larvae develop much slower and may not even survive, and they may not also survive if they are laid on immature and glaucous leaves. Hence, female sawflies search for young adult leaves to lay their eggs on.<ref name="Burton_Burton_2002"/><ref name=SA1992/>

These eggs hatch in two to eight weeks, but such duration varies by species and also by temperature. Until the eggs have hatched, some species such as the small brown sawfly will remain with them and protects the eggs by buzzing loudly and beating her wings to deter predators. There are six larval stages that sawflies go through, lasting 2 – 4 months, but this also depends on the species. When fully grown, the larvae emerge from the trees en masse and burrow themselves into the soil to pupate. During their time outside, the larvae may link up to form a large colony if many other individuals are present. They gather in large groups during the day which gives them protection from potential enemies, and during the night they disperse to feed. The emergence of adults takes awhile, with some emerging anywhere between a couple months to 2 years. Some will reach the ground to form pupal chambers, but others may spin a cocoon attached to a leaf. Larvae that feed on wood will pupate in the tunnels they have constructed. In one species, the jumping-disc sawfly (Phyllotoma aceris) forms a cocoon which can act like a parachute. The larvae live in sycamore trees and do not damage the upper or lower cuticles of leaves that they feed on. When fully developed, they cut small perforations in the upper cuticle to form a circle. After this, they weave a silk hammocks within the circle; this silk hammock never touches the lower cuticle. Once inside, the upper-cuticle's disc separates and descends towards the surface with the larvae attaching themselves to the hammock. Once they reach the round, the larvae work their way into a sheltered area by jerking their discs along.<ref name="Burton_Burton_2002"/><ref name=SA1992/>

The majority of sawfly species produce a single generation per year, but others may only have one generation every two years. Most sawflies are also female, making males rare.<ref name=SA1992/>

  • Life cycle of the sawfly Cladius difformis, the bristly rose slug
  • Cladius difformis larva.jpg

    Larva

  • Cladius difformis pupa dorsal.jpg

    Pupa, dorsal view

  • Cladius difformis pupa ventral.jpg

    Pupa, ventral view

  • Cladius difformis female.jpg

    Female

  • Cladius difformis male.jpg

    Male

Relationship with humansEdit

File:Diprionpini.jpg
The pine sawfly Diprion pini is a serious pest of forestry.
File:Yellow Flag Iris Sawfly (Rhadinoceraea micans) showing damage to plant.JPG
Caterpillar-like larvae of Iris sawfly on yellow flag, showing damage to host plant

Sawflies are major economic pests of forestry. Species in the Diprionidae, such as the pine sawflies, Diprion pini and Neodiprion sertifer, cause serious damage to pines in regions such as Scandinavia. D. pini larvae defoliated Template:Convert in the largest outbreak in Finland, between 1998 and 2001. Up to 75% of the trees may die after such outbreaks, as D. pini can remove all the leaves late in the growing season, leaving the trees too weak to survive the winter.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Little damage to trees only occurs when the tree is large or when there is minimal presence of larvae. Eucalyptus trees can regenerate quickly from damage inflicted by the larvae; however, they can be substantially damaged from outbreaks, especially if they are young. The trees can be defoliated completely and may cause "dieback", stunting or even death.<ref name=SA1992/>

Sawflies are serious pests in horticulture. Different species prefer different host plants, often being specific to a family or genus of hosts. For example, Iris sawfly larvae, emerging in summer, can quickly defoliate species of Iris including the yellow flag and other freshwater species.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Similarly the rose sawflies, Arge pagana and A. ochropus, defoliate rose bushes.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

The giant woodwasp or horntail, Urocerus gigas, has a long ovipositor, which with its black and yellow colouration make it a good mimic of a hornet. Despite the alarming appearance, the insect cannot sting.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The eggs are laid in the wood of conifers such as Douglas fir, pine, spruce, and larch. The larvae eat tunnels in the wood, causing economic damage.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Alternative measures to control sawflies can be taken. Small-scale, mechanical methods include visually confirming larval presence on a plant and subsequently removing them, either by pruning damaged leaves or removing the larvae from the leaves they are on. Larvae typically try to remain hidden on the underside of foliage. Upon removing larvae and/or the affected leaves from plants, they may be dispatched by squishing, or, alternatively, the cut leaves with larvae still attached may be fed to birds; if larger animals do not prey upon them, other insects will. However, this is not practical or useful for some, thus the larvae can be quickly dispatched by simply dropping foliage into a vessel of plain or saltwater, diluted hydrogen peroxide or isopropyl alcohol, insecticidal soap, or other garden chemical. In large-scale, industrial settings, where beneficial insect predators can also be used to eliminate larvae, as well as parasites, which have both been previously used in control programs.<ref name=SA1992/>Template:Sfn Small trees can be sprayed with a number of chemicals, including maldison, dimethoate, carbaryl, imidacloprid, etc., if removing larvae from trees is not effective enough.<ref name=SA1992/>

ReferencesEdit

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BibliographyEdit

Further readingEdit

External linksEdit

GeneralEdit

TaxonomyEdit

Template:Hymenoptera Template:Taxonbar Template:Authority control

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